Application of signal processing techniques to ultrasonic ToFD testing of austenitic welds

Tabatabaeipour, Seyed Morteza and Honarvar, Farhang (2010) Application of signal processing techniques to ultrasonic ToFD testing of austenitic welds. In: 10th European Conference on Non-Destructive Testing,, 2010-06-07 - 2010-06-11. (https://www.ndt.net/search/docs.php3?id=9411)

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Abstract

The desired properties of austenitic steels lead to their numerous applications in many industries. Welded austenitic materials have columnar grains, anisotropic elastic properties, and a heterogeneous structure. These properties are controlled by both the procedure and parameters of welding. The complex structure of austenitic welds can distort and scatter the ultrasonic beams. In ultrasonic testing of austenitic welds, this situation can lead to low signal-to-noise ratio and make the interpretation of results quite difficult. In this paper, the relatively new ultrasonic technique of time-of-flight diffraction (ToFD) is used for inspection of austenitic welds. Special signal processing techniques are implemented in order to improve the low signal-to-noise ratio of ultrasonic signals and make the interpretation of results easier.

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